ok my car bearly has enough power to move itself. To start off with like 2 weeks ago my car started to hesitate while under accel. but only for like a sec. so friday i went and bought plugs and wires for it i tryed to buy cap and rotor but they had wrong cap and rotor and i couldnt find the right 1 so i had to order them online, should be here sometime this week, Well thew plugs and wires worked so that was cool i decided to put some 91 and some injector cleaner in it to clean it out. thats where the problem starts after i put the gas in after i put the injector cleaner in it my car starting running like crap. I drove it for a little while b/c it wasnt bad, so i went to the gas station and put more gas b/c just for shits and giggles i thought the ratio of injector cleaner was to high and that all it was burning so i filled up the half tank i just drove off so it was full again. I was told by a friend that it did the same thing to him 1 time and he had to just get through that tank and then it was fine again. So i let it sit out front and run yesturday,it seemed to be getting worse. This morning i tryed to leave for work and my car didnt have enough power to make it up the drive way, So i had to get a running start to get it moving well i started on my way to worrk and in 4th gear i couldnt get over 35 so i was like screw it im going back home well then it decided to throw out a little backfire and blow a hole in my muffler and now it sounds like a major rice b/c the rpms are high and its loud as shit but it really isnt going anywhere. Ichanged fuel filter yesturday, and change plugs and wires, will do cap and rotor when i get it. I am going to check injectors today and make sure im getting good fuel from the pump, maybe its the cat clogged up? if the fuel system is fine im gonna gut my cat and see if that works b/c i have to go get a new exhaust now anyway. if anybody knows anything else i can check that would be great. sorry for the novel but i wanted to let you have all the details. my car is a 88 si. thanks in advace for any help